Liu, Xiaopeng;
Zhu, Yijia;
Alam, Firoz;
Wang, Tianlei;
Parkin, Ivan P;
Wang, Mingqing;
Deka Boruah, Buddha;
(2024)
Isotype heterojunction graphitic carbon nitride photocathode for photo-accelerated zinc-ion capacitors.
Journal of Materials Chemistry A
10.1039/d4ta03938f.
(In press).
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Abstract
Photoelectrodes that combine light harvesting and energy storage within a single material represent an effective approach for developing standalone devices for solar energy capture and storage. However, achieving high-performance photoelectrodes requires precise tuning of optical, electrochemical and interface properties. In this study, we introduce an optimization approach designed to improve the charge storage, optical properties, and interface adjustments of graphitic carbon nitride (g-C3N4) when used as the photoelectrode material in photo-accelerated zinc-ion capacitors (Photo-ZICs). Through the adjustment of precursor ratios, we successfully introduced a g-C3N4 isotype heterojunction electrode via a thermal polycondensation method. This optimized electrode exhibited a performance level four times higher than that of pristine g-C3N4 synthesized from urea, even at a high specific current of 10 000 mA g−1. Additionally, it demonstrated an impressive capacity of 37.62 mA h g−1 with a coulombic efficiency of 99.9% after 10 000 cycles. Furthermore, we explored the potential of a dual heterojunction structure by combining the optimized g-C3N4 isotype heterojunction with titanium dioxide to create highly efficient Photo-ZICs. These assembled devices exhibited remarkable capacity enhancements and cycling stability even under light exposure. As a proof-of-concept experiment, our findings underscore the significant benefits of isotype heterojunctions in enhancing both energy storage capabilities and solar harvesting efficiency, ultimately leading to the development of highly efficient Photo-ZICs.
| Type: | Article |
|---|---|
| Title: | Isotype heterojunction graphitic carbon nitride photocathode for photo-accelerated zinc-ion capacitors |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d4ta03938f |
| Publisher version: | http://dx.doi.org/10.1039/d4ta03938f |
| Language: | English |
| Additional information: | © The Authors 2024. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence (http://creativecommons.org/licenses/by-nc/3.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10196762 |
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